Fig. 7
Variation of mean ⟨ Bz ⟩ values for HD 137949 as a function of MJD between 1957 and 2007. Each point represents the mean field measured by a single observer or team, with the vertical error bar showing the dispersion of individual measures (or an estimate of the uncertainty for the first point), and the horizontal error bar showing the extent in time of the measurement set from that team.
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